One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,8,9)(7,10,11,12)(14,18)(15,20)(21,22,25,28)(23,26,27,24)(1,2,3,4)(5,6)(7,10)(8,9)(11,12)(21,23)(22,24)(25,27)(26,28)(1,2)(3,4)(6,9)(10,12)(13,14)(15,19)(16,20)(17,18)(21,23)(22,26)(24,28)(25,27) involution — undirected(5,7,8,11)(6,10,9,12)(13,15,17,20)(14,19,18,16)(5,6)(7,10)(8,9)(11,12)(13,16,17,19)(14,20,18,15)(21,24,25,26)(22,27,28,23)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.